Er微合金化對2055鋁鋰合金力學(xué)性能及微觀組織的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-04-27
研究了0.2%及0.4%Er的添加對2055 Al-Li合金T8態(tài)時效 (6%預(yù)變形+160℃時效)微觀組織和力學(xué)性能的影響.
Er微合金化對2055鋁鋰合金力學(xué)性能及微觀組織的影響EFFECT OF Er MICRO-ALLOYING ON MECHANICAL PROPRTIES AND?MICROSTRUCTURES OF 2055 Al-Li ALLOY研究了0.2%及0.4%Er的添加對2055 Al-Li合金T8態(tài)時效 (6%預(yù)變形+160℃時效)微觀組織和力學(xué)性能的影響. 結(jié)果表明, 0.2%Er添加顯著降低合金強(qiáng)度, 但延伸率略有增加. 微量 Er 添加未改變 Al-Li 合金中時效析出相的種類, 主要強(qiáng)化相仍然為 T1 相 (Al2CuLi)及θ′相 (Al2Cu), 但時效析出相的數(shù)量明顯減少, 同時時效析出的響應(yīng)速度減緩. 2055 Al-Li 合金中添加微量Er, 凝固時可形成Al8Cu4Er 相粒子, 這些粒子在后續(xù)均勻化及固溶處理時均難以完全溶解至固溶體中, 導(dǎo)致固溶基體中Cu 含量降低, 因而時效時含Cu 析出相T1 相及θ′相含量減少, 合金強(qiáng)度降低.?
Al-Li alloys are considered as the ideal structural materials for aerospace industry because of its low?density, high specific strength and specific elastic modulus as well as low fatigue crack growth rate and good low?temperature performance. 2055 Al-Li alloy among new Al-Li alloys developed recently was a super-high strength?Al-Li alloy. An important method to improve the performance of Al-Li alloys is to add micro-alloying elements.?Er-microalloying in Al alloy has been investigated much, but the study on Al-Li alloy is still seldom reported. In?this work, the effect of 0.2% and 0.4% Er addition on the microstructure and mechanical properties of 2055 Al-Li?alloy sheet with T8 aging (6% cold rolling pre-deformation and aging at 160℃) were investigated. The results?showed that the addition of 0.2% Er significantly decreases the strength by about 50 MPa, but enhances the?elongation; the strength is further decreased by about 100 MPa with the addition of 0.4% Er. The precipitate types?in Er micro-alloyed Al-Li alloy are not changed with the addition of Er, and the aging precipitates are still T1?(Al2CuLi) and θ′ (Al2Cu) phases. In the Er-microalloyed Al-Li alloy, the incubation time of T1 precipitate is?longer, and its precipitation rate is decreased, accordingly the aging response is slowed. Meanwhile, under?peak-aging condition, the fraction of T1 precipitates, especially θ′ precipitates in the Er-microalloyed Al-Li alloy?is decreased, which results in a decrease of strength. As?Er is added to the Al-Li alloy, Er-contained particles?Al8Cu4Er are formed during solidification process, and?their amount is increased with the addition increasing.?These particles cannot be completely dissolved into the alloy matrix during homogenization process. After?solution treatment following cold rolling, they are not yet dissolved into the solid solution. These particles contain?Cu and Er simultaneously, and the concentration of dissolved Cu in solid solution is therefore decreased. With?increasing Er addition, the Cu concentration in solid solution is further decreased. The precipitation rate of T1 is?consequently decreased, slowing the aging response of the Er-microalloyed Al-Li alloy. And this factor also?decreases the fraction of T1 and θ′ precipitates and lowers the alloy strength.
作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，艾荔艾擁有完善的服務(wù)體系和專業(yè)的團(tuán)隊(duì)。在同客戶交易的過程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對當(dāng)前和未來的市場需求，艾荔艾致力于為客戶提供最佳的金屬材料解決方案。
AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
獲取更多我們供應(yīng)的合金和服務(wù)信息，請致電086-021-67660801或發(fā)電子郵件[email protected]聯(lián)系我們，您也可以通過微博，微信，領(lǐng)英，XING，臉書和推特與我們互動。
For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at [email protected]. You can also get in touch on social media, we are constantly active on?Weibo,?Weixin,?LinkedIn,?XING, Facebook?and?Twitter.